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AUSCERT External Security Bulletin Redistribution
ESB-2020.0159
Advisory (icsa-20-014-04) Siemens SINAMICS PERFECT HARMONY GH180
16 January 2020
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AusCERT Security Bulletin Summary
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Product: Siemens Sinamics Perfect Harmony GH180
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Reduced Security -- Console/Physical
Resolution: Patch/Upgrade
CVE Names: CVE-2019-19278
Original Bulletin:
https://www.us-cert.gov/ics/advisories/icsa-20-014-04
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ICS Advisory (ICSA-20-014-04)
Siemens SINAMICS PERFECT HARMONY GH180
Original release date: January 14, 2020
Legal Notice
All information products included in http://ics-cert.us-cert.gov are
provided"as is" for informational purposes only. The Department of Homeland
Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
service, referenced in this product or otherwise. Further dissemination of this
product is governed by the Traffic Light Protocol (TLP) marking in the header.
For more information about TLP, see http://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 6.8
o ATTENTION: Low skill level to exploit
o Vendor: Siemens
o Equipment: SINAMICS PERFECT HARMONY GH180
o Vulnerability: Protection Mechanism Failure
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an unauthorized
attacker with physical access to the affected device to restart the HMI with
disabled security controls, which could be used to launch further attacks
against the affected device.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SINAMICS PERFECT HARMONY GH180, a voltage converter,
are affected:
o All versions of SINAMICS PERFECT HARMONY GH180 Drives:
MLFB 6SR32..-. . . ..-. . . .
MLFB 6SR4. . . -. . . ..-. . . .
MLFB 6SR5. . . -. . . ..-. . . ., with option A30 (HMIs 12 inches or
larger)
o All versions of SINAMICS PERFECT HARMONY GH180 Drives:
MLFB 6SR325.-. . . ..-. . . . (High Availability)
[AusCERT note: version strings appear to have been left blank here]
3.2 VULNERABILITY OVERVIEW
3.2.1 PROTECTION MECHANISM FAILURE CWE-693
The affected device contains a vulnerability that could allow an
unauthenticated attacker to restore the affected device to a point where
predefined application and operating system protection mechanisms are not in
place.
CVE-2019-19278 has been assigned to this vulnerability. A CVSS v3 base score of
6.8 has been calculated; the CVSS vector string is ( AV:P/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens PSIRT reported this vulnerability to CISA.
4. MITIGATIONS
Siemens recommends that affected users contact customer support to obtain
configuration changes. Detailed instructions are available through customer
support. Siemens notes that no other specific mitigations or workarounds have
been identified.
As a general security measure, Siemens strongly recommends users protect
network access to devices with appropriate mechanisms. In order to operate the
devices in a protected IT environment, Siemens recommends users configure the
environment according to Siemens' operational guidelines for Industrial
Security , and follow the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at:
https://www.siemens.com/industrialsecurity
For more information on this vulnerability, please see Siemens security
advisory SSA-242353
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely.
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